Question

Find the length of the side of a square whose area is 441 $m^2$.

Answer 1

We know area of square $={\text{side}}^2$

Thus $\text{side}=\sqrt{\text{Area}}$
Given, area $=441=3\times 3\times 7\times 7$
Therefore, $\text{side}=\sqrt{441}=3\times 7=21$